Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2a95d0d8e36aa8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 11:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e6d8ba3ad26e326a5ad338f64c613bb0 SHA-1: c922c7041a0d92a5c951b11c60dfc22e18a99485 SHA-256: 3f2a95d0d8e36aa8bff0e1ad62b73f023f91490740390286cb219b29dde05b33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of multiple links pointing to compromised upload storage and disposable hosting, combined with a 'download button' heuristic, suggests the document is designed to trick the user into downloading a secondary payload. The ML classifier's output of 0.998549 strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://libron.pl/fckupload/assets/file/88178080008.pdf In PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/mejaligavaxemizuso.pdfIn PDF document text
    • http://polipack.ru/content/file/wilori.pdfIn PDF document text
    • http://dentherapia.hu/files/file/76686319294.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/39230424538.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d4d5840bedc296cdf2859372b353ef53/77551274839.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb4b732078---vekuwigix.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210809002558.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/65475438828.pdfIn PDF document text
    • https://digireg.nu/upload/lujopa.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/3da3bf4344f849cb8b81176dfb595ce0/futevevolev.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210623_8BB0EFA3320D1E5D.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/49787429302.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/47002740909.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/89541844284.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/56740345326.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607122f4cf381---lesoxevosoninilunu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee85d0a9101---zepasatijubenelomuvugek.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/26045880593.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/74286923232.pdfIn PDF document text
    • http://trivio.it/userfiles/files/bukibewisupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cg+police+admit+card+2018+download+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE94 11416 bytes
SHA-256: 68dc95caa838b250911d1233ef96b891379e8fc812adb3cf42eff14d8c695d1c
font_01_sfnt_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 22012 bytes
SHA-256: b5b4e8b2808ade9bc168e560fa371bc589d1e3b45707baabf917cf3d396a383c

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